| 摘要 |
A smoke filter for cigarettes, cigars or pipes employs a manually adjustable needle valve stem in combination with a restricted orifice valve seat axially disposed in one end of a cylindrical condensation chamber. Smoke drawn through the needle valve is compressed and accelerated by its passage through the restricted orifice, and then it expands upon entering the condensation chamber where condensed tars are trapped. One or more lateral grooves formed in the exterior surface of the valve stem prevent complete closure of the needle valve. One disclosed embodiment is in a cigarette holder wherein the condensation chamber is removable and disposable. An alternative embodiment discloses an inexpensive form of the filter attached directly to the tip of a cigarette. A third embodiment discloses a cigarette holder wherein the condensation chamber and mouthpiece are formed of inexpensive molded plastic and are removable as a unit and entirely replaceable.
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